docs: crds are installed by the operator (#809)

Author: sweb

docs/modules/airflow/pages/getting_started/installation.adoc

@@ -67,7 +67,8 @@ Install the Stackable operators:
 include::example$getting_started/code/getting_started.sh[tag=helm-install-operators]
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-Helm deploys the operators in a Kubernetes Deployment and apply the CRDs for the Airflow cluster (as well as the CRDs for the required operators).
+Helm deploys the operators in a Kubernetes Deployment.
+Each operator installs and maintains its own CRDs at startup (see xref:concepts:maintenance/crds.adoc[]).
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